Whittier Narrows Operable Unit Treatment for Drinking Water End Use Project


SCH Number
Lead Agency
Toxic Substances Control, Department of (Department of Toxic Substances Control)
Document Title
Whittier Narrows Operable Unit Treatment for Drinking Water End Use Project
Document Type
MND - Mitigated Negative Declaration
Project Applicant
Department of Toxic Substances Control
Present Land Use
Road Right of Way/Heavy Industrial/Open Space and Recreation and Wildlife Preserve and Sanctuary

Document Description
The project would construct a new 7,265-foot-long blend water supply pipeline, a new 20-foot-long blended water pipeline connection to the existing 30-inch San Gabriel Valley Water Company (San Gabriel) pipeline on Durfee Avenue, and a new off-site booster station (Plant B28 Booster Station). The implementation of the proposed project would provide additional water for blending with groundwater produced from the existing WNOU extraction wells, as well as boosting capacity to deliver this blended water to San Gabriel for distribution to its customers. The purpose of the proposed project is to increase the pumping rate of the existing groundwater extraction wells to contain groundwater contamination within the Main San Gabriel Basin. The project would increase the capture of the contaminants and prevent further migration into the adjoining Los Angeles Central Groundwater Basin (Central Basin) and help protect nearby municipal water supply wells.

Contact Information
Ajit Vaidya
Department of Toxic Substances Control
8800 Cal Center Drive
Sacramento, CA 95826

Phone : (916) 255-3683


34°1'49.6"N 118°3'31.7"W
South El Monte
Los Angeles
Cross Streets
331 Durfee Avenue
Parcel #
Multiple APN's
State Highways
SR 60
South El Monte HS
Legg Lake

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Modification of existing Superfund interim remedy infrastructure)
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Minerals Noise Population/Housing Balance Public Services Recreation/Parks Schools/Universities Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Land Use
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, South Coast Region 5 California Department of Forestry and Fire Protection California Department of Parks and Recreation California Department of Water Resources California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Public Utilities Commission California Regional Water Quality Control Board, Los Angeles Region 4 California State Lands Commission Department of Toxic Substances Control Office of Historic Preservation San Gabriel and Lower Los Angeles Rivers and Mountains Conservancy State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Division of Water Quality State Water Resources Control Board, Division of Water Rights California Department of Transportation, District 7


Environmental Document
Draft IS   PDF 12507 K NOA   PDF 382 K
Notice of Completion_Signed   PDF 3636 K
State Comments
2020089015_Caltrans Comment   PDF 261 K

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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